How can I get my mom to buy me this for my B-Day? Easy 10 Points.?

Okay, so I really want a Paintball gun for my B-Day (Planet Eclipse Etek 3 LT), and it's 495.00, but my Mom doesn't understand that different paintball guns are completely different. She doesn't understand that if a gun is from a better company it's going to be better. She's the average old "Oh you could get the same thing for $150" when you clearly cannot. This gun is the top of the line Tournament level gun, and she offered to buy me an iPad which I responded and told her I don't want one. I have Asperger's Syndrome, and I told her this gun would help me go out with friends more often etc. (which in all honesty it will). I love paintballing and am serious about the sport but she doesn't seem to think that the type of gun you buy makes a difference, I showed her low end and high end gun's (Not to mention this gun has parts from a $1,250 gun the Ego11) and she seems to believe their exactly the same. She doesn't understand the fact that different paintball guns have better part's inside she thinks their all built the same way, and all equally as easy to maintain she thinks Co2 and HPA are the same (I'm gonna get an HPA tank anyways but still). She also says "How long will that gun last you 3 paintball sessions", and I respond to her that it will last a long time (I take good care of my guns) possibly up to 3-4 years, she is still blatantly arrogant towards getting this gun. I'm thinking about making a pro/con list and how this will be better than a iPad, she isn't poor she makes good money (She's a Neurosurgeon aswell as my Father owning a Bussiness). My Father is perfectly fine with me getting this gun, but the only problem with that is that he goes with everything my mother says. Please help I really, really want this gun also the whole "Mom, please I really want this" won't work.